[SI-LIST] Re: Determination of relative permittivity

I've lost the reference to an old microwave book that explained the cavity
resonance method. One method was to make a disk of the material of a certain
thickness that was the same radius as a cylindrical microwave cavity. You
measured the resonant frequency and cavity Q before the disk was inserted
and after the disk was inserted into the bottom of the cavity. The change in
f gave you the dielectric constant and the change in Q gave you your loss
tangent. I can't remember the equations to relate delta fr and delta Q to Dk
and tan delta. Does anyone else remember this technique? The cavity was
cylindrical with a side launch from rectangular waveguide.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Matthias Bergmann
Sent: Wednesday, May 25, 2005 7:32 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Determination of relative permittivity


Hello,

quite a lot of discussions deal about the (effective) permittivity, but how
do I determine it ?
I would like to measure the complex permittivity of synthetic materials in
a frequency range between 1 till 500 MHz. I know there are methods like
Parallel plate,
Reflection wave, S Parameters or Cavity  to measure it, but, it's sort of
weird,
I didn't find any paper which explains how to construct a measurement
system.
So, are there any basic papers or books you can recommend me ?

Best regards, Matthias Bergmann

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